Hi there,
I am Dr. Deepak, I work in Emergency Department, which includes patient who are children. Its good to see that you are very concerned about the you kid health.
You have mentioned that he gets sick repeatedly and always gets shortness of breaths when doing physical activities and he is general has low energy level. Its a good thing that he has improved and is now better. you also mentioned that sometimes he also gets chest pains and during routine check up it was found that he is having a
heart murmur.
Your question is if all these are connected?
I feel there is a 50-50 percent chance that it might be connected. It may or may not be connected, It would be really better and helpful, if you are able to find the cause of murmur by showing a cardiologist and doing an echo. If the cardiologist doesn't find a murmur then there is no need for ECHO.
I have seen few of the kids with similar problem where their energy level is low and repeated have infection mostly
chest infection, they had some problem in the structure of there heart, which leads of improper functioning of heart and makes lungs more prone for infection.
thank you
Hope I have dealt with your concern and child should not have any major problem.